Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddda1f7b4b9f71d…

MALICIOUS

PDF

61.5 KB Created: 2021-06-18 12:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8097b2fcc93eb915ffd1b89b95498c32 SHA-1: 5aff54fde33bd3f832cf8a542bb83a92df8b0279 SHA-256: 9ddda1f7b4b9f71d62b2354e37420a19b13c2c914d1efcd754e1a3d809c6f5bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits PDF vulnerabilities or contains malicious links. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting pages. The embedded URLs and the nature of the heuristics strongly suggest an exploitation attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://delphin-bau.com/ckfinder/upload/files/xekapofukikuno.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c46a83342d93d98aad833a823b468887/wirugadelokuzuzuxusaxivor.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rrdnlfhg75f7jc08sak4bl697s/79178207771.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/fqcq5d882lbnb1oju5935b0v0o/birugadokokavegimaxi.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30a8a48db---nafojalurumujovejukov.pdf
    • https://dacinsara.ro/fckfiles/file/redarakalarezagaveloni.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b742f4be412---298432342.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942560156d8---mosofatigewizopewepotudu.pdf
    • https://dcoderesearch.com/uploads/70597915683.pdf
    • http://bukharasuwanee.com/sites/default/files/file/virirexamiketaxalo.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98909cc7f3---moxonov.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/57338675a773a8f1130dec9def57da13/17384611599.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/krnc5ol4mhgj57252n5kncmf94/4083139404.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/34ea4fb0fa77fbe69ac40616b0384efb/pomumevariwe.pdf
    • http://say-international.eu/userfiles/file/kivesemokodomebokadipim.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ebdb93994---31834923109.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=der+eisendrache+fire+bow
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b634.bin
4b898d446835a30c8ecb0186a73ef1f013fa0d44609c9f61e659e71386ca8462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB634 5308 bytes
font_01_sfnt_off0000c853.bin
c6d8c60181af813b323fc50a29d43e689c96b3c68db7f1bd61cb7865d4412730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 9632 bytes

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